2000 rmk800 need help jetting

[00rmk800]

Need some tips with jetting my sled got a low end bog, 450/470 mains, pilots are 55, needle Position #2, have a slp pipe, vforce reeds gutted air box and do most of my riding under 3000ft elevation, also when I turn the fuel/air screw no change in rpm,

 

[Old Boy]

Watch your plugs. Try needle in a leaner position give it a run. Re check plugs. Do you have hot or cold plugs. Plug shoul tell you what to do. Then work with mains.

 

[CrankShop910]

Is it a lean bog or rich, I would pull the carbs and clean them,and the pilots too. Set the fuel screw at 1 1/2 turns to start.
Jetting looks good,
what shape is the belt, and when did you last replace the clutch springs.

 

[00rmk800]

It's a rich bog, plugs are a bit dark, idles funny every onc in awlie it make a burping sound like its getting a extra shot of fuel

 

[00rmk800]

Just serviced clutches start of season with new springs, primary has black spring with 10-62 seconday has stock set up #3 hole

 

[HotShotHarry]

Id try a smaller pilot jet as it controls the fuel up till approx 1/4 throttle.

 

[00rmk800]

How much smaller? 50? Or a 45?

 

[00rmk800]

I put in all new main,pilots and air jets in last week and still no change same numbers just I cleaned the old ones 3 times figured there cheap enough so I put new ones in

 

[HotShotHarry]

How much smaller? 50? Or a 45?

I would start with 50's first and see if there is an improvement. If it still has a slight bog at low RPM- try 45.s. Make sure to set your air mixture screw at 1and 1/2 turns out. Im assuming you have Mikuni round slide carbs on there- take a 1/4 in. drill bit and put it in the throat of the carb and set the slides using the adjuster nut so that each slide just touches the drill bit. This will ensure that each carb is pulling in a equal amount of air.

 

[darkday]

I think u are jetted to rich, I had same setup and run 390/370 with 50 pilot needle #2 from top of jet needle, around grande prairie. I would run 350/330 in the mountains, same slp pipe and gutted air box. This was jetting for 5c to -12c. U should be safe to -30c with your jetting. If plugs are dark go leaner until u get a nice brown.

 

[darkday]